hive 之 get_json_object 函数使用

Posted 2022-08-11 闭关苦炼内功

1）数据

["name":"大郎","sex":"男","age":"25","name":"西门庆","sex":"男","age":"47"]

2）取出第一个json对象

select get_json_object('["name":"大郎","sex":"男","age":"25","name":"西门庆","sex":"男","age":"47"]','$[0]');

结果是：

"name":"大郎","sex":"男","age":"25"

3）取出第一个json的age字段的值

SELECT get_json_object('["name":"大郎","sex":"男","age":"25","name":"西门庆","sex":"男","age":"47"]',"$[0].age");

结果是：
25

---

• 取出第1个json对象

select get_json_object('["name":"大郎","sex":"男","age":"25","name":"西门庆","sex":"男","age":"47"]','$[0]');

• 取出第2个json对象

select get_json_object('["name":"大郎","sex":"男","age":"25","name":"西门庆","sex":"男","age":"47"]','$[1]');

---

• 取出第1个json对象的age字段的值

select get_json_object('["name":"大郎","sex":"男","age":"25","name":"西门庆","sex":"男","age":"47"]','$[0].age');

• 取出第2个json对象的name字段的值

select get_json_object('["name":"大郎","sex":"男","age":"25","name":"西门庆","sex":"男","age":"47"]','$[1].name');